perf evlist: Introduce backward_mmap array for evlist

Add backward_mmap to evlist, free it together with normal mmap.

Improve perf_evlist__pick_pc(), search backward_mmap if evlist->mmap is
not available.

This patch doesn't alloc this array. It will be allocated conditionally
in the following commits.

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: He Kuang <hekuang@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468485287-33422-8-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index d15517e..dbcb223 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -509,7 +509,7 @@ static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evli
        if (!evlist)
                return 0;
 
-       maps = evlist->mmap;
+       maps = backward ? evlist->backward_mmap : evlist->mmap;
        if (!maps)
                return 0;
 
@@ -696,8 +696,12 @@ perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused
 static const struct perf_event_mmap_page *
 perf_evlist__pick_pc(struct perf_evlist *evlist)
 {
-       if (evlist && evlist->mmap && evlist->mmap[0].base)
-               return evlist->mmap[0].base;
+       if (evlist) {
+               if (evlist->mmap && evlist->mmap[0].base)
+                       return evlist->mmap[0].base;
+               if (evlist->backward_mmap && evlist->backward_mmap[0].base)
+                       return evlist->backward_mmap[0].base;
+       }
        return NULL;
 }
 

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 54ae0a0..24927e1 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -123,6 +123,7 @@ static void perf_evlist__purge(struct perf_evlist *evlist)
 void perf_evlist__exit(struct perf_evlist *evlist)
 {
        zfree(&evlist->mmap);
+       zfree(&evlist->backward_mmap);
        fdarray__exit(&evlist->pollfd);
 }
 
@@ -973,17 +974,20 @@ static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
 {
        int i;
 
-       if (evlist->mmap == NULL)
-               return;
+       if (evlist->mmap)
+               for (i = 0; i < evlist->nr_mmaps; i++)
+                       perf_mmap__munmap(&evlist->mmap[i]);
 
-       for (i = 0; i < evlist->nr_mmaps; i++)
-               perf_mmap__munmap(&evlist->mmap[i]);
+       if (evlist->backward_mmap)
+               for (i = 0; i < evlist->nr_mmaps; i++)
+                       perf_mmap__munmap(&evlist->backward_mmap[i]);
 }
 
 void perf_evlist__munmap(struct perf_evlist *evlist)
 {
        perf_evlist__munmap_nofree(evlist);
        zfree(&evlist->mmap);
+       zfree(&evlist->backward_mmap);
 }
 
 static struct perf_mmap *perf_evlist__alloc_mmap(struct perf_evlist *evlist)

diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 9e680c6..07a1ad0 100644 (file)
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -61,6 +61,7 @@ struct perf_evlist {
        } workload;
        struct fdarray   pollfd;
        struct perf_mmap *mmap;
+       struct perf_mmap *backward_mmap;
        struct thread_map *threads;
        struct cpu_map    *cpus;
        struct perf_evsel *selected;